The index files are all different, and contain URLs I have visited in the last four years, and many URLs I have never visited, many with eastern european names. There are also many blocks of upper ASCII characters.

My desktop with IE-8 and XP does not have these files. What evil program is doing this?

I turned off updates as suggested, but the IETldCache and PrivacIE are still updating. I uninstalled Google Desktop earlier in the week, so these files should not be coming from that. (Google was using 5 GB of memory.) The file formats in notepad look quite similar. Thanks for your suggestions.